23 across
Joke
about
race
riot
disturbed
islander
(6,5)
Joke about race riot disturbed islander (6,5)
hints
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The definition is at the end of the clue.
How the clue works
Look at islander — that's your definition, someone from Puerto Rico. Take PUN (a joke) and put it around an anagram of race riot (with "disturbed" signalling the anagram), and you get PU + ERTORICA + N = PUERTO RICAN.